package thread;

public class SyncDemo {
    public static void main(String[] args) {
        Table table=new Table();
        Thread t1 = new Thread(){
            public void run(){
                while (true){
                    int bean=table.getBeans();
                    Thread.yield();
                    System.out.println(getName()+"；"+bean);
                }
            }
        };
        Thread t2 = new Thread(){
            public void run(){
                while (true){
                    int bean=table.getBeans();
                    Thread.yield();
                    System.out.println(getName()+"；"+bean);
                }
            }
        };
        t1.start();
        t2.start();

    }
}

class Table {
    private int beans = 30;

    public synchronized int getBeans() {
        if (beans == 0) {
            throw new RuntimeException("没有了");
        }
        Thread.yield();
        return beans--;
    }
}